my plants have red colour stem on a bit of it help ????

hi on the stem of my plant and on the stem attaching the leafs there are red colour lines and its appeared on one of my other plants on the same places what is it wat do i need to do or is not a bad thing??

mine have that too,don't worry about it.It's the strain or it's plant's color.The bad color's are yellow,white and brown.Those are the only bad color's I looked at where bad.When I first saw red on mine I thought it was pretty cool hoping to get some red leaves that would be cool looking but i dont have that strain.

those are the symptoms of a phosphorous starved plant....bonbon http://oregonstate.edu/dept/hort/dpd/chemkey.htm